fix error Treating warnings as errors because process.env.CI = true. in vercel cra code example

Example 1: Treating warnings as errors because process.env.CI = true.

CI= npm run build
       or
CI=false npm run build 
use this commands

Example 2: Treating warnings as errors because process.env.CI = true. github

- name: test
  image: node
  commands:
  - unset CI
  - npm install
  - npm run tests

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Misc Example

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